Automatic shut-off To conserve battery life the meter shuts off automatically after three minutes of non-use

Accuracy: ±4% of reading

and 5-pack — perfect for occasional users

or other interfering substances that can poison the reference junction and cause drift

Milwaukee MA991B/1 Lab-Grade Glass pH Probe – BNC Connector, Gel-Filled, Single Junction lab grade pH meter Automatic shut-off To conserve batteryMilwaukee MA991B 1 Lab Grade Glass pH Probe BNC Connector Precision pH measurement built for education, student labs, and general purpose water testing. The Milwaukee MA991B 1 is a professional grade single junction glass pH electrode engineered for environments where accuracy, ease of cleaning, and minimal maintenance matter most from high school science classrooms to university research labs. Picture a busy lab period: students rotating through